JSON for Modern C++ 3.8.0

accept
accept
accept
allocator_type
array
array_t
at
at
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basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
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basic_json
basic_json
begin
begin
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~basic_json
| ## ◆ operator+=() [1/4]
reference nlohmann::basic_json::operator+= | ( | basic_json && | val | ) |
| inline
  add an object to an array Appends the given element val to the end of the JSON value. If the function is called on a JSON null value, an empty array is created before appending val. Parameters
  [in] | val | the value to add to the JSON array
  Exceptions
  type_error.308 | when called on a type other than JSON array or null; example: `"cannot use push_back() with number"`
  Complexity Amortized constant. Example The example shows how `push_back()` and `+=` can be used to add elements to a JSON array. Note how the `null` value was silently converted to a JSON array. 1 #include <iostream> 2 #include <nlohmann/json.hpp> 3 4 using json = nlohmann::json; 5 6 int main() 7 { 8 // create JSON values 9 json array = {1, 2, 3, 4, 5}; 10 json null; 11 12 // print values 13 std::cout << array << '\n'; 14 std::cout << null << '\n'; 15 16 // add values 17 array.push_back(6); 18 array += 7; 19 null += "first"; 20 null += "second"; 21 22 // print values 23 std::cout << array << '\n'; 24 std::cout << null << '\n'; 25 } Output (play with this example online):
      [1,2,3,4,5]
      null
      [1,2,3,4,5,6,7]
      ["first","second"]
  The example code above can be translated with
      g++ -std=c++11 -Isingle_include doc/examples/push_back.cpp -o push_back
Since version 1.0.0 Definition at line 21023 of file json.hpp.

nlohmann::basic_json::array
static basic_json array(initializer_list_t init={})
explicitly create an array from an initializer list
Definition: json.hpp:17559
nlohmann::basic_json::push_back
void push_back(basic_json &&val)
add an object to an array
Definition: json.hpp:20998
nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2774